I've had my WSM out when a friend had his HMR out, you can notice the difference hearing the two firing beside each other, but if you don't hear them in comparison, like if you walked up to someone while they were shooting an HMR or WSM you probably wouldn't recognize which was which without a lot of time around the two rifles.
Franklin Armory makes the AR17 which is another manufacturer of the 17 WSM as well, though you'd have to get irunguns or prophet river to bring it up for you.
I'm happy with my Bmag as well, though it's been modified beyond recognition
Great. Thanks for the reply.